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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Destruction of C2H4O2 isomers in ice-phase by X-rays: Implication on the abundance of acetic acid and methyl formate in the interstellar medium

Texto completo
Autor(es):
Rachid, Marina G. [1] ; Faquine, Karla [1] ; Pilling, S. [1, 2]
Número total de Autores: 3
Afiliação do(s) autor(es):
[1] Univ Vale Paraiba UNIVAP, Lab Astroquim & Astrobiol LASA, Av Shishima Hifumi 2911, BR-12244000 Sao Jose Dos Campos, SP - Brazil
[2] ITA DCTA, Dept Fis, Inst Tecnol Aeronaut, BR-12228900 Sao Jose Dos Campos, SP - Brazil
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: Planetary and Space Science; v. 149, n. SI, p. 83-93, DEC 1 2017.
Citações Web of Science: 4
Resumo

The C2H4O2 isomers methyl formate (HCOOCH3), acetic acid (CH3COOH) and glycoaldehyde (HOCH2CHO) have been detected in molecular clouds in the interstellar medium, as well as, hot cores, hot corinos and around protostellar objects. However, their abundances are very different, being methyl formate more abundant than the other two isomers. This fact may be related to the different destruction by ionizing radiation of these molecules. The goal of this work is experimentally study the photodissociation processes of methyl formate and acetic acid ices when exposed to broadband soft X-ray from 6 up to 2000 eV. The experiments were performed coupled to the SGM beamline in the Brazilian Synchrotron Light Source (LNLS/CNPEM) at Campinas, Brazil. The simulated astrophysical ices (12 K) were monitored throughout the experiment using infrared vibrational spectroscopy (FTIR). The analysis of processed ices allowed the determination of the effective destruction cross sections of the parent molecules as well as the effective formation cross section of daughter molecular species such as CO, CO2, H2O, CH4 and H2CO (only for methyl formate) and the hydrocarbons C2H6 and C5H10 (only for acetic acid). The half-lives of molecules at ices toward young stellar objects (YSOs) and inside molecular clouds (e.g. Sgr B2 and W51) due to the presence of incoming soft X-rays were estimated. We determined the effective formation rate and the branching ratios for assigned daughter species after the establishment of a chemical equilibrium. The main product from photodissociation of both methyl formate and acetic acid is CO, that can be formed by recombination of ions, formed during the photodissociation, in the ice surface. The relative abundance between methyl formate and acetic acid (N-CH3COOH/N-HCOOCH3) in different astronomical scenarios and their column density evolution in the presence of X-rays were calculated. Our results suggest that such radiation field can be one of the factors that explain the difference in the C2H4O2 isomers abundances. (AU)

Processo FAPESP: 16/11334-5 - Simulação experimental dos efeitos de partículas energéticas (íons e elétrons) na superfície de corpos gelados do sistema solar: transformações físico-química de gelos contendo a mistura H2O:CO2:CH4 (10:1:1)
Beneficiário:Marina Gomes Rachid
Linha de fomento: Bolsas no Brasil - Mestrado
Processo FAPESP: 14/08643-0 - Estudo da foto-degradação de gelos astrofísicos contendo ácido acético e seus isômeros (formiato de metila e glicoladeído)
Beneficiário:Karla Faquine Rodrigues
Linha de fomento: Bolsas no Brasil - Iniciação Científica
Processo FAPESP: 09/18304-0 - Síntese e degradação de espécies moleculares pré-bióticas em atmosferas planetárias, cometas e gelos interestelares simulados
Beneficiário:Sergio Pilling Guapyassu de Oliveira
Linha de fomento: Auxílio à Pesquisa - Apoio a Jovens Pesquisadores
Processo FAPESP: 12/17248-2 - Estudo da produção de moléculas de interesse astrobiológico em experimentos simulando a lua Encélado na presença de fótons UV, raios-X, elétrons e íons rápidos
Beneficiário:Alexandre Bergantini de Souza
Linha de fomento: Bolsas no Brasil - Doutorado